The torsional spectrum of gaseous CH3CD3 has been measured between 230 and 280 cm(-1) under relatively large pressure-path length conditions. The observations were made using a modified Bomem spectrometer at a resolution of 0.016 cm(-1) and an absorption path of 20 m. The gas temperature and pressure were 190 K and 82 Torr, respectively, The prominent features of the spectrum are the P, Q, and R branches of the torsional fundamental (upsilon(6) = 1 <-- 0). The P and R branches consist of broad peaks from 0,3 to 0.5 cm(-1) wide showing partially resolved relational structure. A frequency analysis combining the present far-infrared frequencies with molecular beam, microwave, and mm-wave measurements from previously reported experiments yielded an improved set of torsion-rotation parameters. An intensity analysis was carried om to obtain the torsional dipole moments. The torsional dipole components mu(perpendicular to)(T) and (mu(parallel to)(T) - mu(perpendicular to)(T)) were determined to be 14.0(1.5) and -39.6(4.0) mu D, respectively. The conditions under which there is agreement between the experimental values and those calculated from theoretical expressions are discussed.